Silverlight Controls and Silverlight Toolkit

Re: TextBox.Text won't bind trough a dependency property

mrjvdveen — Thu, 02 Jul 2009 07:04:52 GMT

That does actually work! Thanks.

However I don't realy understand why my solution does work for a usercontrol wrapping a combobox. I used exactly the same method for passing on bindings to the selecteditem property and it works fine. Any insights?

Re: TextBox.Text won't bind trough a dependency property

Ag. — Wed, 01 Jul 2009 14:55:27 GMT

You should call UpdateText in the property changed callback not in the setter

public string Text
{
    get { return (string) GetValue(TextProperty); }
    set { SetValue(TextProperty, value); }
}

public static readonly DependencyProperty TextProperty =
    DependencyProperty.Register(
        "Text", typeof (string), typeof (LabeledTextBox),
        new PropertyMetadata(string.Empty, OnTextChanged));

private static void OnTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    var labeledTextBox = d as LabeledTextBox;
    if (labeledTextBox == null) return;
    labeledTextBox.UpdateText(e.NewValue as string);
}

TextBox.Text won't bind trough a dependency property

mrjvdveen — Wed, 01 Jul 2009 12:53:35 GMT

Here is what I'm trying to do. I want to have a control that combines a TextBlock to display a label and a TextBox to display/edit a value. As this combines two basic controls, I figured I would go with a UserControl. The Xaml for it is very easy:

All is still well.

I've added some dependency properties to my new LabeledTextBox UserControl, to allow setting some properties on the underlying controls. One of these properties is the Text property:

        public string Text
        {
            get { return (string)GetValue(TextProperty); }
            set
            {
                SetValue(TextProperty, value);
                UpdateText(value);
            }
        }

        // Using a DependencyProperty as the backing store for Text. This enables animation, styling, binding, etc...
        public static readonly DependencyProperty TextProperty =
            DependencyProperty.Register("Text", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(string.Empty));

The UpdateText(value) line only passes the value to the textBox.Text property. Now in my application I want to databind to the Text property of my UserControl, which in turn should pass the binding to the textBox inside. It doesn't databind. It doesn't show any initial values.

Help?